"Honestly, a lot of them are just looking for a phone to make phone calls; they don't seem to care about the operating system. I guess you could say that they buy them by accident."
That may be the case in the UK, but in the US it's not very likely. Most are tied to dataplans (at least to get the subsidized cost). They'd be steered to feature phones if they just wanted phone calls, except by possibly the least ethical salespeople.
I suspect its probably more that they don't keep up with this stuff on daily basis like us. Android, iPhone, Windows -- to them Windows is as popular as those other two brands. And then after playing with the phone some of these people walk out with it. Others Android, others iPhone.